Electric drive axle and automobile

Abstract

The utility model relates to the technical field of automobile driving, in particular to an electric drive axle and an automobile. The electric drive axle in the automobile comprises an axial magnetic flux motor, a transmission mechanism, a speed change mechanism and output half shafts, the input end of the speed change mechanism is connected with the output ends of the two output half shafts, the two output half shafts are arranged at the two ends of the speed change mechanism in the width direction of the automobile, and the transmission mechanism comprises a planetary gear train. The axial magnetic flux motor, the planetary gear train and the speed change mechanism are arranged in the length direction of the vehicle, the axial direction of the axial magnetic flux motor is the length direction of the vehicle, the output end of the axial magnetic flux motor is connected with a sun gear in the planetary gear train, and a planetary gear ring in the planetary gear train is fixed relative to the axial magnetic flux motor. A planet carrier of the planetary gear train is connected with the input end of the speed change mechanism, and the axial magnetic flux motor arranged in the length direction of the vehicle drives the two output half shafts.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile driving, in particular to an electric driving bridge and an automobile. Background Art

[0002] An electric drive axle is a device that converts electrical energy into mechanical energy and is used to drive a vehicle or other means of transportation. An electric drive axle is usually composed of a motor, a transmission, and other related components.

[0003] In the prior art, the motor of the electric drive axle is a radial flux motor, and the radial flux motor is arranged along the width direction of the vehicle, that is, the motor shaft of the radial flux motor is parallel to the axial direction of the electric drive axle. Correspondingly, the transmission device adopts a parallel shaft reduction box. Due to the long axial length of the radial flux motor, the electric drive axle with the above arrangement is large in size, heavy in weight, and occupies a lot of space, which cannot meet the actual installation requirements.

[0004] Therefore, it is urgent to invent an electric drive axle and a car to solve the above problems. Utility Model Content

[0005] The utility model aims to provide an electric drive axle and a car, so as to realize the driving of the vehicle by an axial flux motor, and to realize the arrangement of the axial flux motor along the length direction of the vehicle, thereby saving installation space.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Electric drive axle, including:

[0008] Output half shaft;

[0009] A speed change mechanism, wherein an input end of the speed change mechanism is connected to output ends of the two output half shafts, and the two output half shafts are arranged at both ends of the speed change mechanism along the vehicle width direction;

[0010] An axial flux motor and a transmission mechanism, wherein the transmission mechanism includes a planetary gear train, the axial flux motor, the planetary gear train and the speed change mechanism are arranged along the length direction of the vehicle, and the axial direction of the axial flux motor is the length direction of the vehicle;

[0011] The output end of the axial flux motor is connected to the sun gear in the planetary gear system, the planetary ring gear in the planetary gear system is relatively fixed to the axial flux motor, and the planet carrier of the planetary gear system is connected to the input end of the speed change mechanism.

[0012] As an optional solution, the electric drive axle further includes:

[0013] a housing in which the axial flux motor and the planetary gear train are mounted;

[0014] The outer peripheral wall of the planetary gear ring is provided with a spur spline, the inner cavity wall of the housing is provided with a keyway, and the spur spline is butt-jointed and fixed with the keyway.

[0015] As an optional solution, at least two spur splines are circumferentially spaced apart on the outer circumferential wall of the planetary gear ring, and at least two key slots are circumferentially spaced apart on the inner cavity wall of the housing, and the spur splines are arranged in one-to-one correspondence with the key slots;

[0016] There is a gap between the outer peripheral wall of the planetary gear ring and the inner cavity wall of the housing, and the extension length of the keyway along the radial direction of the planetary gear ring is greater than the extension length of the spur spline along the radial direction of the planetary gear ring.

[0017] As an optional solution, the housing includes:

[0018] a casing body, the casing body having a receiving cavity for receiving the axial flux motor and the planetary gear train, the key groove being arranged on the inner cavity wall of the receiving cavity; and

[0019] The end cover is used to seal the opening of the accommodating cavity.

[0020] As an optional solution, a plug-in protrusion is provided on any one of the casing body and the end cover, and a plug-in groove is provided on the other one, and the plug-in protrusion is plugged and fixedly connected to the plug-in groove.

[0021] As an optional solution, at least two plug-in protrusions are arranged at intervals along a preset contour, and at least two plug-in grooves are arranged at intervals along the preset contour, and the plug-in protrusions and the plug-in grooves are arranged in a one-to-one correspondence.

[0022] As an optional solution, an avoidance through hole is provided on the end cover, and the output end of the planet carrier can extend out of the accommodating cavity along the avoidance through hole and be connected to the input end of the speed change mechanism.

[0023] As an optional solution, a first meshing member is disposed at the output end of the planet carrier, and a second meshing member is disposed at the input end of the speed change mechanism, and the first meshing member is gear-engaged with the second meshing member.

[0024] As an optional solution, the first meshing member is a bevel gear or a bevel gear ring, and the second meshing member is a bevel gear or a bevel gear ring.

[0025] The automobile comprises wheels, a vehicle body and the electric drive axle as described above, wherein the electric drive axle is mounted on the vehicle body, and each of the output half shafts is connected to one of the wheels.

[0026] Beneficial effects of the utility model:

[0027] The electric drive axle provided by the utility model realizes the effect of synchronously driving the two output half-shafts to work by arranging the two output half-shafts at the two ends of the speed change mechanism along the width direction of the vehicle, and connecting the input ends of the two output half-shafts with the output ends of the speed change mechanism. By arranging the axial flux motor, the planetary gear system in the transmission mechanism and the speed change mechanism along the length direction of the vehicle, and ensuring that the axial direction of the axial flux motor is the length direction of the vehicle, the axial flux motor arranged along the length direction of the vehicle drives the two output half-shafts, and the driving effect is good. Not only can the size of the electric drive axle along the width direction of the vehicle be shortened to meet the actual installation requirements, but the center of gravity of the electric drive axle can also be brought closer to the center. Moreover, the axial flux motor is lighter than the radial flux motor, which is more conducive to the lightweight upgrade of the electric drive axle.

[0028] In addition, the electric drive axle uses an axial flux motor as the power source. Taking advantage of the high torque of the axial flux motor, no additional shifting mechanism is required in the electric drive axle to increase the torque. The power is transmitted between the planetary gear system and the speed change mechanism through the planetary carrier instead of the planetary ring gear, which can further increase the transmission torque and meet the actual power requirements.

[0029] The utility model also provides a car, which, by applying the electric drive axle, realizes the driving of two output half-axles by the axial flux motor arranged along the length direction of the vehicle, has a good driving effect, can not only shorten the size of the electric drive axle along the width direction of the vehicle, but also make the center of gravity of the electric drive axle closer to the center, and the axial flux motor is lighter than the radial flux motor, which is more conducive to the lightweight upgrade of the car. In addition, the electric drive axle in the car adopts the axial flux motor as the power source, and the axial flux motor has the characteristic of large torque, so that no additional shift mechanism is required in the electric drive axle to increase the torque, and the planetary gear system and the speed change mechanism transmit power through the planetary carrier instead of the planetary gear ring, which can further improve the transmission torque and meet the actual power demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is one of the structural schematic diagrams of the electric drive axle provided by the embodiment of the utility model;

[0031] Figure 2 This is the second structural schematic diagram of the electric drive axle provided by the embodiment of the utility model;

[0032] Figure 3 It is a partial cross-sectional schematic diagram of an electric drive axle provided by an embodiment of the utility model;

[0033] Figure 4This is one of the structural schematic diagrams of the axial flux motor, planetary gear train and housing provided by the embodiment of the utility model;

[0034] Figure 5 This is the second structural schematic diagram of the axial flux motor, planetary gear train and housing provided by the embodiment of the utility model;

[0035] Figure 6 This is the third structural diagram of the axial flux motor, planetary gear train and housing provided by the embodiment of the utility model

[0036] Figure 7 This is the fourth structural schematic diagram of the axial flux motor, planetary gear train and housing provided by the embodiment of the utility model;

[0037] Figure 8 A fifth structural diagram of the axial flux motor, planetary gear train and housing provided by the embodiment of the utility model;

[0038] Fig. 9 It is a cross-sectional schematic diagram of an axial flux motor, a planetary gear train and a housing provided by an embodiment of the utility model;

[0039] Fig.10 It is a schematic diagram of the mechanism of the electric drive axle provided by the embodiment of the utility model;

[0040] Fig.11 It is a structural schematic diagram of a casing body and a planetary gear ring provided by an embodiment of the utility model;

[0041] Fig.12 yes Fig.11 A partial enlarged schematic diagram in the middle.

[0042] In the figure:

[0043] 100. Axial flux motor;

[0044] 200, planetary gear train; 210, sun gear; 220, planetary gear; 230, planet carrier; 231, first meshing member; 240, planetary ring gear; 241, spur spline;

[0045] 300, speed change mechanism; 310, second engagement member;

[0046] 400, output half shaft;

[0047] 500, housing; 510, housing body; 511, keyway; 512, plug-in slot; 520, end cover; 521, plug-in protrusion; 522, avoidance through hole. DETAILED DESCRIPTION

[0048] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0049] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0051] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0052] An electric drive axle is a device that converts electrical energy into mechanical energy, and is used to drive a vehicle or other means of transportation. An electric drive axle is usually composed of a motor, a transmission device, and other related components. In the prior art, the motor of the electric drive axle is a radial flux motor, and the radial flux motor is arranged along the width direction of the vehicle, that is, the motor shaft of the radial flux motor is parallel to the axial direction of the electric drive axle. Correspondingly, the transmission device adopts a parallel shaft reduction box. Due to the long axial length of the radial flux motor, the electric drive axle with the above arrangement is large in size, heavy in weight, and occupies a lot of space, which cannot meet the actual installation requirements.

[0053] In order to solve the above problems, Figures 1 to 10As shown, this embodiment provides an electric drive axle. The electric drive axle includes an axial flux motor 100, a transmission mechanism, a speed change mechanism 300 and an output half shaft 400, wherein the input end of the speed change mechanism 300 is connected to the output ends of the two output half shafts 400, and the two output half shafts 400 are arranged at both ends of the speed change mechanism 300 along the width direction of the vehicle, the transmission mechanism includes a planetary gear train 200, the axial flux motor 100, the planetary gear train 200 and the speed change mechanism 300 are arranged along the length direction of the vehicle, the output end of the axial flux motor 100 is connected to the sun gear 210 in the planetary gear train 200, the planetary gear ring 240 in the planetary gear train 200 is relatively fixed to the axial flux motor 100, and the planet carrier 230 of the planetary gear train 200 is connected to the input end of the speed change mechanism 300.

[0054] The electric drive axle achieves the effect of the same speed change mechanism 300 synchronously driving the two output half shafts 400 to work by arranging the two output half shafts 400 at the two ends of the speed change mechanism 300 along the width direction of the vehicle and connecting the input ends of the two output half shafts 400 to the output ends of the speed change mechanism 300. By arranging the axial flux motor 100, the planetary gear system 200 in the transmission mechanism and the speed change mechanism 300 along the length direction of the vehicle and ensuring that the axial direction of the axial flux motor 100 is the length direction of the vehicle, the axial flux motor 100 arranged along the length direction of the vehicle drives the two output half shafts 400, and the driving effect is good. It can not only shorten the size of the electric drive axle along the width direction of the vehicle to meet the actual installation requirements, but also make the center of gravity of the electric drive axle closer to the center. In addition, the axial flux motor 100 is lighter than the radial flux motor, which is more conducive to the lightweight upgrade of the electric drive axle.

[0055] In addition, the electric drive axle uses the axial flux motor 100 as a power source. Taking advantage of the large torque of the axial flux motor 100, no additional shift mechanism is required in the electric drive axle to increase the torque. In addition, the planetary gear system 200 and the speed change mechanism 300 transmit power through the planetary carrier 230 instead of the planetary gear ring 240, which can further increase the transmission torque and meet the actual power demand.

[0056] It should be noted that, in other embodiments, the transmission mechanism may further include an additional reduction gear train or an acceleration gear train, and the input end of the additional reduction gear train or the acceleration gear train is connected to the output end of the axial flux motor 100, and the output end of the additional reduction gear train or the acceleration gear train is connected to the sun gear 210 to change the output power of the axial flux motor 100. This embodiment does not make specific limitations.

[0057] In this embodiment, the electric drive axle also includes a casing 500, wherein the axial flux motor 100 and the planetary gear system 200 are both installed in the casing 500, the outer peripheral wall of the planetary ring gear 240 is provided with a spur spline 241, and the inner cavity wall of the casing 500 is provided with a keyway 511, the spur spline 241 is docked and fixed with the keyway 511, and the extension length of the keyway 511 along the radial direction of the planetary ring gear 240 is greater than the extension length of the spur spline 241 along the radial direction of the planetary ring gear 240. By installing both the axial flux motor 100 and the planetary gear system 200 in the casing 500, the protection of the axial flux motor 100 and the planetary gear system 200 can be improved. By setting a spur spline 241 on the outer peripheral wall of the planetary ring gear 240 and setting a keyway 511 on the inner wall of the casing 500, the spur spline 241 and the keyway 511 are connected to each other, so that the planetary ring gear 240 and the casing 500 can be relatively fixed, thereby achieving relative fixation of the planetary ring gear 240 and the axial flux motor 100.

[0058] As an alternative, Fig.11 and Fig.12 As shown, at least two spur splines 241 are circumferentially spaced apart on the outer circumferential wall of the planetary gear ring 240, and at least two keyways 511 are circumferentially spaced apart on the inner cavity wall of the housing 500. The spur splines 241 and the keyways 511 are arranged in a one-to-one correspondence, and there is a gap between the outer circumferential wall of the planetary gear ring 240 and the inner cavity wall of the housing 500. The extension length of the keyway 511 along the radial direction of the planetary gear ring 240 is greater than the extension length of the spur splines 241 along the radial direction of the planetary gear ring 240. By arranging at least two spur splines 241 at intervals in the circumferential direction on the outer periphery of the planetary gear ring 240 and arranging at least two keyways 511 at intervals in the axial direction on the inner wall of the casing 500, the fixing effect of the spur splines 241 and the keyways 511 can be further improved, thereby improving the fixing effect of the planetary gear ring 240 and the casing 500. By ensuring that there is a gap between the outer wall of the planetary gear ring 240 and the inner wall of the casing 500, the radial extension length of the keyway 511 along the planetary gear ring 240 is greater than the radial extension length of the spur spline 241 along the planetary gear ring 240. When the axial flux motor 100 drives the planetary gear train 200 to operate, the planetary gear ring 240 can move radially, eliminate the position error inside the planetary gear train 200, make the rotation of the sun gear 210 and the planetary gear 220 in the planetary gear train 200 smoother, and make the meshing between the sun gear 210, the planetary gear 220 and the planetary gear ring 240 more uniform.

[0059] It should be noted that, in this embodiment, 20 spur splines 241 are arranged at intervals on the outer peripheral wall of the planetary gear ring 240, and 20 key slots 511 are arranged circumferentially on the inner cavity wall of the housing 500. In other embodiments, the number of spur splines 241 and key slots 511 can also be adjusted within two or more ranges according to actual needs, and it is only necessary to ensure that the spur splines 241 and the key slots 511 are arranged one by one. This embodiment does not make specific limitations.

[0060] Specifically, in this embodiment, the extension length of the keyway 511 along the radial direction of the planetary gear ring 240 is 3 mm, and the extension length of the spur spline 241 along the radial direction of the planetary gear ring 240 is 2 mm. In other embodiments, the extension length of the keyway 511 along the radial direction of the planetary gear ring 240 and the extension length of the spur spline 241 along the radial direction of the planetary gear ring 240 can also be adjusted according to actual needs, as long as the extension length of the keyway 511 along the radial direction of the planetary gear ring 240 is greater than the extension length of the spur spline 241 along the radial direction of the planetary gear ring 240, which is not specifically limited in this embodiment.

[0061] Combination Figures 4 to 8 The specific structure of the housing 500 is described. The housing 500 includes a housing body 510 and an end cover 520. The housing body 510 has a housing cavity for accommodating the axial flux motor 100 and the planetary gear train 200. A keyway 511 is provided on the inner wall of the housing cavity. The housing cavity has an opening, and the end cover 520 is used to block the opening. By opening the opening in the housing cavity in the housing body 510, the axial flux motor 100 and the planetary gear train 200 are placed in the housing cavity in the housing body 510, which can facilitate the inspection and maintenance of the axial flux motor 100 and the planetary gear train 200. By using the end cover 520 to block the opening, it is possible to prevent debris or dust from entering the housing cavity along the opening, thereby improving the protection of the axial flux motor 100 and the planetary gear train 200.

[0062] As an alternative, Figure 4 and Figure 5As shown, a plug-in protrusion 521 is provided on any one of the housing body 510 and the end cover 520, and a plug-in groove 512 is provided on the other, and the plug-in protrusion 521 is plugged and fixed with the plug-in groove 512. By providing the plug-in protrusion 521 on any one of the housing body 510 and the end cover 520, and providing the plug-in groove 512 on the other, and utilizing the plug-in fixation of the plug-in protrusion 521 and the plug-in groove 512, the end cover 520 is blocked from the open opening, and the structure is simple, the disassembly method is convenient, and the blocking effect is good. It should be noted that, in this embodiment, the plug-in protrusion 521 is provided on the end cover 520, and the plug-in groove 512 is provided on the housing body 510. In other embodiments, the plug-in protrusion 521 may also be provided on the housing body 510, and the plug-in groove 512 may also be provided on the end cover 520, which is not specifically limited in this embodiment.

[0063] In addition, at least two plug-in protrusions 521 are arranged at intervals along the preset contour, and at least two plug-in grooves 512 are arranged at intervals along the preset contour, and the plug-in protrusions 521 and the plug-in grooves 512 are arranged one-to-one. By arranging at least two plug-in protrusions 521 and at least two plug-in grooves 512 at intervals along the preset contour, it is ensured that the plug-in protrusions 521 and the plug-in grooves 512 are arranged one-to-one, which can further improve the fixing effect between the end cover 520 and the housing body 510. It should be noted that in this embodiment, 18 plug-in grooves 512 are arranged at intervals according to a circular contour on the end surface of the housing body 510 close to the end cover 520, and 18 plug-in protrusions 521 are arranged at intervals according to a circular contour on the end surface of the end cover 520 close to the housing body 510, and the center of the circular contour is the axis of the axial flux motor 100. In other embodiments, the specific number of the plug-in protrusions 521 and the plug-in grooves 512 may be adjusted within two or more ranges according to actual needs, and the specific shape of the preset profile may be adjusted according to actual needs, which is not specifically limited in this embodiment.

[0064] In addition, a threaded through hole may be opened on the end cover 520, and a threaded blind hole may be opened on the casing body 510, and the threaded through hole and the threaded blind hole may be coaxially aligned, and bolts may be used to threadably fix the threaded through hole and the threaded blind hole in sequence to connect and fix the end cover 520 to the casing body 510, which is not specifically limited in this embodiment.

[0065] As an alternative, Figure 4 As shown, the end cover 520 is provided with an avoidance through hole 522, and the output end of the planet carrier 230 can extend out of the accommodation cavity along the avoidance through hole 522 and be connected to the input end of the speed change mechanism 300. By providing the avoidance through hole 522 on the end cover 520, the output end of the planet carrier 230 can extend out of the accommodation cavity along the avoidance through hole 522 and be connected to the output end of the speed change mechanism 300, thereby realizing power transmission between the planet carrier 230 accommodated in the housing 500 and the speed change mechanism 300.

[0066] like Fig.10 As shown, the output end of the planet carrier 230 is provided with a first meshing member 231, and the input end of the speed change mechanism 300 is provided with a second meshing member 310, and the first meshing member 231 is gear-engaged with the second meshing member 310. By providing the first meshing member 231 at the output end of the planet carrier 230 and the second meshing member 310 at the input end of the speed change mechanism 300, the power transmission between the planet carrier 230 and the speed change mechanism 300 is realized by the meshing transmission of the first meshing member 231 and the second meshing member 310.

[0067] Since the axial direction of the axial flux motor 100 is the length direction of the vehicle, after the sun gear 210 in the planetary gear system 200 is connected to the axial flux motor 100, the output direction of the planetary carrier 230 in the planetary gear system 200 is perpendicular to the input direction of the speed change mechanism 300. In order to change the direction of the transmitted power, the first meshing member 231 is a bevel gear or a bevel gear ring, and the second meshing member 310 is a bevel gear or a bevel gear ring. The meshing of bevel gears, bevel gears and bevel gear rings, or bevel gear rings and bevel gear rings is used to change the direction of power transmission, so as to transmit the driving force of the axial flux motor 100 to the speed change mechanism 300. The structure is simple and the design is ingenious.

[0068] It should be noted that, in this embodiment, the first gearing 231 has a smaller specification, the second gearing 310 has a larger specification, the first gearing 231 is a bevel gear, and the second gearing 310 is a bevel gear ring, so as to reduce the weight of the second gearing 310. In other embodiments, the first gearing 231 may also be a bevel gear ring, and the second gearing 310 may also be a bevel gear, which is not specifically limited in this embodiment.

[0069] This embodiment also provides a car. The car includes a wheel, a vehicle body and the above-mentioned electric drive axle, wherein the electric drive axle is installed on the vehicle body, and each output half shaft 400 is connected to a wheel. By applying the above-mentioned electric drive axle, the car realizes the driving of two output half shafts 400 by the axial flux motor 100 arranged along the length direction of the vehicle, and the driving effect is good. It can not only shorten the size of the electric drive axle along the width direction of the vehicle, but also make the center of gravity of the electric drive axle closer to the center, and the axial flux motor 100 is lighter than the radial flux motor, which is more conducive to the lightweight upgrade of the car. In addition, the electric drive axle in the drive car adopts the axial flux motor 100 as the power source, and the torque of the axial flux motor 100 is large. No additional shifting mechanism is required in the electric drive axle to increase the torque, and the planetary gear system 200 and the speed change mechanism 300 are used for power transmission through the planetary carrier 230, rather than through the planetary gear ring 240, which can further improve the transmission torque and meet the actual power demand.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An electric drive axle, characterized in that: include: Output half shaft (400); A speed change mechanism (300), wherein an input end of the speed change mechanism (300) is connected to output ends of two output half shafts (400), and the two output half shafts (400) are arranged at two ends of the speed change mechanism (300) along the vehicle width direction; An axial flux motor (100) and a transmission mechanism, wherein the transmission mechanism comprises a planetary gear train (200), the axial flux motor (100), the planetary gear train (200) and the speed change mechanism (300) are arranged along the length direction of the vehicle, and the axial direction of the axial flux motor (100) is the length direction of the vehicle; The output end of the axial flux motor (100) is connected to the sun gear (210) in the planetary gear system (200), the planetary ring gear (240) in the planetary gear system (200) is relatively fixed to the axial flux motor (100), and the planet carrier (230) of the planetary gear system (200) is connected to the input end of the speed change mechanism (300).

2. The electric drive axle according to claim 1, characterized in that: The electric drive axle further comprises: A housing (500), wherein the axial flux motor (100) and the planetary gear train (200) are both installed in the housing (500); The outer peripheral wall of the planetary gear ring (240) is provided with a spur spline (241), the inner cavity wall of the housing (500) is provided with a keyway (511), and the spur spline (241) is butt-jointed and fixed to the keyway (511).

3. The electric drive axle according to claim 2, characterized in that: At least two spur splines (241) are circumferentially spaced apart on the outer circumferential wall of the planetary gear ring (240), and at least two key slots (511) are circumferentially spaced apart on the inner cavity wall of the housing (500), and the spur splines (241) and the key slots (511) are arranged in a one-to-one correspondence; There is a gap between the outer peripheral wall of the planetary gear ring (240) and the inner cavity wall of the housing (500), and the extension length of the keyway (511) along the radial direction of the planetary gear ring (240) is greater than the extension length of the spur spline (241) along the radial direction of the planetary gear ring (240).

4. The electric drive axle according to claim 2, characterized in that: The housing (500) comprises: a casing body (510), the casing body (510) having a receiving cavity for receiving the axial flux motor (100) and the planetary gear train (200), the key groove (511) being arranged on the inner cavity wall of the receiving cavity; and The end cover (520) is used to seal the opening of the accommodating cavity.

5. The electric drive axle according to claim 4, characterized in that: Any one of the housing body (510) and the end cover (520) is provided with a plug-in protrusion (521), and the other is provided with a plug-in groove (512), and the plug-in protrusion (521) is plugged and fixed with the plug-in groove (512).

6. The electric drive axle according to claim 5, characterized in that: At least two of the plugging protrusions (521) are arranged at intervals along a preset contour, and at least two of the plugging grooves (512) are arranged at intervals along the preset contour. The plugging protrusions (521) and the plugging grooves (512) are arranged in a one-to-one correspondence.

7. The electric drive axle according to claim 4, characterized in that: The end cover (520) is provided with an avoidance through hole (522), and the output end of the planet carrier (230) can extend out of the accommodating cavity along the avoidance through hole (522) and be connected to the input end of the speed change mechanism (300).

8. The electric drive axle according to any one of claims 1 to 7, characterized in that: The output end of the planet carrier (230) is provided with a first meshing member (231), and the input end of the speed change mechanism (300) is provided with a second meshing member (310), and the first meshing member (231) is gear-engaged with the second meshing member (310).

9. The electric drive axle according to claim 8, characterized in that: The first meshing member (231) is a bevel gear or a bevel gear ring, and the second meshing member (310) is a bevel gear or a bevel gear ring.

10. An automobile, characterized in that It comprises wheels, a vehicle body and an electric drive axle as claimed in any one of claims 1 to 9, wherein the electric drive axle is mounted on the vehicle body, and each of the output half shafts (400) is connected to one of the wheels.

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